Mistakes are inevitable. I made a few, some worse than others. If the mistake is not noticeable and does not impede on wear-ability or approvals, its not a big deal. However, making ABS paste and using it to fill a wayward hole, is not very hard. It creates more time and labor, but its a relatively easy thing to do. If it were me, I'd likely live with it. Luckily, screen accuracy allows for less than perfect builds.